Perhaps you should try some spelling variations:
13th communication » 13 communication, month communication, truth communication
development plans » development planning, development policy, development policies
technology 4.2 » technology 2.2, technology 3.2, technology 4.1
4.2 relations » 4.2 relation, 1.2 relations, 2.2 relations
relations 6.1 » relations 2.1, relations 3.1, relations 5.1
costs career » costs chapter, costs case, costs clear
6.1 active » 1.1 active, 3.1 active, 8.6.1 active
plans can » plans a, plans bad, plans c

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology 4.2 relations 6.1 active 13th communication costs career development plans can.*.